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Jaden, currently dating 21-year-old Sarah Snyder, appeared to be engrossed in his phone as he made his way back to his temporary digs.

The screen star and musician took to Twitter in the hours counting down to his birthday to inform fans that he'd be uploading a new track to Soundcloud once his night out came to an end.

Celebration: The group of revellers had just returned from a night of fun that included dinner at Soho's Sketch

Black magic: She was seen wearing a sleeveless black minidress as she made her way into the luxury hotel

Standing tall: She added more height to her towering stance with a pair of vertiginous black heels

Hair we go: Her voluminous raven tresses fell most of the way down her back in gentle waves

Social media: The group took to their respective social media accounts to document parts of their night out

Phoning home? Jaden appeared to be engrossed in his smartphone as he strolled into his temporary digs

Soon after the clock struck midnight, Willow shared a shot on Instagram of herself, her brother and friend Harry Hudson riding a carousel as she wished her brother a happy birthday.

On Monday, Jaden was spotted enjoying a sushi meal with his girlfriend Sarah in Malibu, California.

The lovebirds were first spotted together at Kanye West's headline-grabbing New York Fashion Week presentation in September.

Pretty blonde Sarah has made a name for herself as an aspiring model and social media star, gaining a following of more than 700,000 on her Instagram.

Sibling love: The rapper and actor's younger sister Willow, 15, was also spotted among the group

Birthday boy: The talented son of Will and Jada Pinkett Smith was out celebrating his 18th birthday

Black to basics: He stepped out in an all-black ensemble that included skinny jeans and a bomber jacket

Music: As the strike of midnight approached on his big day, Jaden told fans he'd upload a track on Soundcloud

Jet-setter: Jaden touched down in the English capital earlier this week from his hometown of Los Angeles

Tress-ed to impress: The teen star's trademark locks poked out from beneath his stylish headgar

In a new interview with Nylon magazine, Jaden defended his androgynous dress sense, explaining: 'The world is going to keep bashing me for whatever I do, and I’m going to keep not caring.

'I’m taking the brunt of it so that later on, my kids and the next generations of kids will all think that certain things are normal that weren’t expected before my time.'

'You just have to believe in yourself, you know,' Jaden went on, adding that his goal is to ensure that 'in five years when a kid goes to school wearing a skirt, he won’t get beat up and kids won’t get mad at him.'

The celebrity offspring drew headlines earlier this year after he was chosen to appear in Louis Vuitton's spring/summer 2016 women’s campaign.

Fantastic voyage: Early Friday, Willow shared a shot of herself enjoying a carousel ride with Jaden and a pal

Sights and sounds: Willow has been sharing snaps of herself in London since touching down in the city

That's amore: Jaden is currently dating Sarah Snyder, with whom he was first spotted at Kanye West's New York Fashion Week presentation in September

Media darlings: The photogenic couple often share images of each other on their social media accounts